Let's say the goal is 345-350 whp on an MR and sticking with the stock turbo.
To date, I have the AMS FMIC, AEM intake, HFC, RRE Stealth. Current tune on 91 from RRE is at 315 whp, 320 wtq.
My thoughts:
Pros of E85:
Keeping the stock camshaft, can switch back to 91 with ease..
Good power, same rpm range, same drivability
Cons of E85:
No E85 stations nearby (irvine)
Quality of the E85, ethanol content
Less than 200 mile range on a full tank
Pros of Cam upgrade:
Not having to fill up every 150 miles
Con of Cam upgrade:
Valvetrain may be more stressed (valve springs)
Warranty may be gone, lol